Scientists believe they have worked out a formula to calculate how "beer
goggles" affect a drinker's vision, BBC reports. The drink-fuelled phenomenon
is said to transform supposedly "ugly" people into beauties - until the
morning after.

Researchers at Manchester University say while beauty is in the eye of the
beer-holder, the amount of alcohol consumed is not the only factor. Additional
factors include the level of light in the pub or club, the drinker's own
eyesight and the room's smokiness.
The distance between two people is also a factor.

They all add up to make the aesthetically-challenged more attractive,
according to the formula:

The formula can work out a final score, ranging from less than one - where
there is no beer goggle effect - to more than 100. Nathan Efron, Professor of
Clinical Optometry at the University of Manchester, said: "The beer goggles
effect isn't solely dependent on how much alcohol a person consumes, there are
other influencing factors at play too.

"For example, someone with normal vision, who has consumed five pints of beer
and views a person 1.5 meters away in a fairly smoky and poorly lit room, will
score 55, which means they would suffer from a moderate beer goggle effect."
The research was commissioned by eye care firm Bausch & Lomb PureVision. A
poll showed that 68% of people had regretted giving their phone number to
someone to whom they later realized they were not attracted. A formula rating
of less than one means no effect. Between one and 50 the person you would
normally find unattractive appears less "visually offensive".
Non-appealing people become suddenly attractive between 51 and 100. At more
than 100, someone not considered attractive looks like a super model.

Editors-note  An alcohol unit is 10ml or
8 grams of pure alcohol. The number of units in a drink depends on what you're
drinking - how strong it is and how much there is. You may have seen examples
of drinks that contain one unit, but these examples are often out of date, for
instance: Half a pint of 3.5% beer/lager is one unit BUT many continental
lagers are closer to 5% while extra strong lagers can be as strong as 9%! One
small (125 ml) glass of wine at 9% is one unit BUT who uses small glasses?
Certainly not pubs and probably not at home either. Plus most wines are now
about 11-13%.